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Biomolecules — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryBiomolecules1 Mark
MCQ
Which of the following statements is not correct?
  • A
    Proteins are poly amides formed from aminoacids.
  • B
    Except glycine, all other amino acids show optical activity.
  • C
    Natural proteins are made up of $L$ isomers of amino acids.
  • ✓
    In amino acids $\mathrm{NH}_2$​ and $\text{COOH}$ groups are attached to different carbon atoms.
✓

Answer

Correct option: D.
In amino acids $\mathrm{NH}_2$​ and $\text{COOH}$ groups are attached to different carbon atoms.
  1. Proteins are poly amides formed from alpha amino acids. Thus, the option $A$ is correct.
  2. Except glycine, all other amino acids show optical activity as they contain chiral carbon atom. Glycine is achiral. Thus, option $B$ is correct.
  3. Natural proteins are made up of L isomers of amino acids. Thus, statement $C$ is correct.
  4. In amino acids $\mathrm{NH}_2$​ and $\text{COOH}$ groups are attached to same carbon atom.

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